Linked from
The 16 pages that link to Hexavalent chromium, each with the reason it gives.
DichromateNarrower topic: Dichromate is one member of this hazardous chemical class.
Chromic acidNarrower topic: Chromic acid belongs to this hazardous oxidation-state family.
Chrome yellowRelated: Chromate contains chromium in this toxic oxidation state.
Chromium platingRelated: Conventional plating baths can contain this highly hazardous chromium form.
CrocoiteRelated: Crocoite contains chromium in this oxidation state as chromate.
Chromate and dichromateNarrower topic: Both ions contain chromium in this oxidation state.